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Route · PSC → SEA · 2020–2025 BTS data

Pasco/Kennewick/Richland to Seattle

According to PlainFlights' route traffic ranking (BTS On-Time Performance total flights), PSC to SEA (Pasco/Kennewick/Richland to Seattle) ranks #762 of 4927 tracked domestic routes by total flights (most flights = #1).

Data updated 2026-06-13

88.4%
On-time
+9.4 pts
vs US avg
73 min
Delay when late
13,305
Flights
#762 of 4927
Corpus placement

Cancelled

0.7%

Best Month

Mar 2024 94%

Worst Month

Jan 2024 73%

Distance

172 mi

Carriers

5

Monthly Performance

Recent 24 months of route data.

Period Flights Delayed Cancelled Diverted Carriers
Dec 2025 159 20 0 0 AS,OO
Nov 2025 163 15 7 0 OO,AS
Oct 2025 213 24 2 0 AS,OO
Sep 2025 167 20 0 0 OO,AS
Aug 2025 180 22 2 0 OO,AS
Jul 2025 185 24 0 0 AS,OO
Jun 2025 192 27 0 0 AS,OO
May 2025 235 31 2 0 AS,OO
Apr 2025 146 12 0 0 OO,AS
Mar 2025 133 15 0 0 AS,OO
Feb 2025 122 28 1 0 AS,OO
Jan 2025 153 26 0 0 AS,OO
Dec 2024 189 26 1 0 AS,OO
Nov 2024 155 21 0 0 OO,AS
Oct 2024 143 10 0 0 AS,OO
Sep 2024 115 15 1 1 OO,AS
Aug 2024 157 25 0 0 AS,OO
Jul 2024 177 34 0 0 AS,OO
Jun 2024 166 31 1 0 AS,OO
May 2024 169 23 0 0 AS,OO
Apr 2024 144 14 0 0 AS,OO
Mar 2024 119 7 0 0 AS,OO
Feb 2024 110 13 1 0 AS,OO
Jan 2024 125 34 8 0 AS,OO

PSC–SEA seasonal on-time pattern

Best: March (91.8%) · weakest: December (79.0%)

75%80%85%90%95% JanFebMarAprMayJunJulAugSepOctNovDec 79%

Strongest calendar month

March

91.8% on-time · ~187 flights/mo

Busiest calendar month

July

~209 flights/mo avg

Weakest calendar month

December

79.0% on-time · ~172 flights/mo

Cancellation Rate

0.7%

26 of 3,817 flights

Diversion Rate

0.0%

1 of 3,817 flights

Explore origin & destination

On-time and delay data for the airports this route connects.

PSC - Pasco/Kennewick/Richland

Full on-time, delay-cause, and seasonal performance for Pasco/Kennewick/Richland, WA.

PSC on-time profile

SEA - Seattle

Full on-time, delay-cause, and seasonal performance for Seattle, WA.

SEA on-time profile

Compare the two airports

See PSC and SEA side by side on delays, cancellations, and reliability.

Compare PSC vs SEA

Origin-hub reliability standing

Among PSC's stronger departures

PSC → SEA posts a 88.4% on-time rate, landing in the ≥85% band with 5 of 6 BTS-tracked routes leaving Pasco/Kennewick/Richland. The same hub also shows 1 mid-band and 0 challenged departures · fleet-wide on-time rank #353 of 4927 (highest on-time = #1).

What the Data Says About PSC to SEA

Pasco/Kennewick/Richland to Seattle (PSC to SEA) is one of the more dependable pairings in the BTS On-Time Performance dataset: a 88.4% on-time rate across 13,305 flights, with delays that do happen averaging 72.5 minutes. The corridor runs roughly 172 miles and is served by 5 carriers. Over the most recent 24 months, 26 of 3,817 flights were cancelled (0.7%) and 1 diverted (0.0%).

The monthly split is wide on this route: Mar 2024 posted the strongest performance at 94% on-time, while Jan 2024 came in at just 73% - a 21-point swing worth factoring into travel timing.

On the multi-year calendar, PSC–SEA peaks in March at 91.8% on-time while July carries the heaviest traffic (~209 flights per month) ; the softest month is December at 79.0%, a 12.8-point swing that repeats because the corridor's weather and holiday mix stays stable year to year.

Frequently Asked Questions

Where does PSC to SEA rank among US routes by traffic? ▼
According to PlainFlights' route traffic ranking, PSC to SEA ranks #762 of 4927 tracked domestic routes by total flights (most flights = #1). That ordinal matches our busiest-routes listing (total_flights DESC). See /methodology#corpus-placement for the exact sort basis.
How often are flights delayed from PSC to SEA? ▼
Flights from Pasco/Kennewick/Richland to Seattle have a 88.4% on-time rate based on 13,305 flights. The average delay is 72.5 minutes. The best recent month was Mar 2024 with 94% on-time.
What is the cancellation rate for PSC to SEA? ▼
Over the last 24 months, 0.7% of flights on this route were cancelled (26 of 3,817 flights) and 0.0% were diverted.
How far is the flight from PSC to SEA? ▼
The flight distance from Pasco/Kennewick/Richland (PSC) to Seattle (SEA) is approximately 172 miles. This route is served by 5 carriers.
When is the best time to fly from PSC to SEA? ▼
The best recent month for on-time performance was Mar 2024 (94% on-time). The worst was Jan 2024 (73% on-time). Consider booking during months with historically better performance.

Airports on this route

PSC Airport

Pasco/Kennewick/Richland
SEA Airport

Seattle
Data source

Data Source: Bureau of Transportation Statistics (BTS), On-Time Performance Data. Statistics reflect cumulative performance across all available reporting periods.

Read our methodology - how this data is sourced, computed, and verified.

Using PSC–SEA data

PSC–SEA runs 9.4 pts above the national 79% average; the remaining risk is month-to-month swing and carrier mix, not a weak headline rate.

  • Compare PSC and SEA airport profiles: delay causes and top routes differ even on the same corridor. PSC airport
  • If your dates flex, March (91.8% on-time) beats December (79.0%) on this corridor. Seasonal chart
  • 4 other routes post a similar 88.4% on-time rate; compare before you commit to this pairing. Similar routes

On-time rate reflects the BTS historical average across all reporting carriers on this origin–destination pair, not any single flight or booking recommendation.

Data sourced from U.S. Department of Transportation Bureau of Transportation Statistics (BTS) On-Time Performance data. See our methodology for details. Retrieved and formatted by PlainFlights

Every figure on PlainFlights is rendered directly from BTS On-Time Performance data, no number is typed in by an editor. This page aggregates this specific route's on-time performance and monthly trend, live from the dataset. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.